单项选择题

From this passage we can know in America, a summer holiday begins in July.

A． Right
B． Wrong
C． Doesn't say
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单项选择题
Both he and I ______ hard at Chinese.
A． am working
B． is working
C． are working
单项选择题
—Must I dean the room now—No, you ______.
A． can't
B． mustn't
C． needn't
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